7% = QL rertilized epys, ----k‘- mggggn._- 2 4 ime (/hours) fl/l‘é’l’ a'/!u tion of sperm Fig.I. Preservation of fertilizing capacity by sturgeon spermatozoa in water. The milt of 5 males of Acipenser giildenstddti was diluted (I:9) with water (temp. I4. 8.17 4°c). Fertilized epgs,% e 1100000 1: /0000 11000 1:100 19 Dilution gf sperm Fig.2. Insemination of the lake trout roe with different methods, dry (I), semi-dry (2) and wet (3)_opes. Sperm density, I. I9 x 1010/ml ( temp. 7. 8°C 1040